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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

Every now and then whenever there is no activity(if I do not use mouse and keyboard) for 10-12 minutes on my computer(Debian Sarge), the screen goes blank. If I press any key or just move the mouse, the screen comes back. What could be the reason? Is this some kind of Standby mode or ACPI issue? Also the monitor light is still green(and not orange).

Do you have DPMS turned on for monitor? It shows in /etc/X11/XF86Config-4 or you might have turned it on under kde display settings or gnome>desktop>Preferences>energy saving. On my pc I have DPMS on with screensaver; so after a period of inactivity screensaver starts until I touch key or move mouse.